When a building or bridge or other substantial structure is built in the United States, it must be designed by a professional engineer (structural / civil) (PE). And when I say designed, I'm talking about using mathematical equations to model natural events that we may and probably will never witness and designing the primary and secondary members, connections, etc. to resist these forces.

Professional engineers must have years of experience and education before they can take their licensing test.

Once they pass the test, they take an oath.

The oath is to protect the life, health, property, and welfare of the people of the state they are licensed in.

A PE is then given a seal with their license # and every project they take responsibility for will bear their seal.

So, please, do not accuse me or the other tens of thousands of structural/civil PE's of dubious or subversive behavior.

I'm in agreement with the final report from NIST.

The WTC buildings standing for as long as they did is a testament to the skill and experience of my profession.

As far as the site you linked to in an earlier post, the joists running perpendicular to the main floor joists were used to brace the chords of the barjoists. These barjoists are typically used to reduce the unbraced length of the chord. Also, there were structural drawings for the WTC. Please see the links I provided.

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